Report.java

package dashboard;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;

public class Report {

    private static final String FILE_SEPARATOR = System.getProperty("file.separator");

    public static void page() {

        CodeUtil.clearScreen();

        String path = getPath();
        File serverStatsFile = new File(path + FILE_SEPARATOR + "dashboard" + FILE_SEPARATOR + "files" + FILE_SEPARATOR + "monthstats.csv");

        //Gets data:
        ServerStats serverStats = new ServerStats();
        serverStats.load(serverStatsFile.getAbsolutePath());
        ServerStats[] servers = serverStats.getServers();

        if (servers != null && servers.length > 0) {
            displayGraph(servers);
        } else {
            System.out.println("No server statistics available.");
        }

        System.out.print("\nPress any key to go to the Navigation page...");
        waitForUserInput();

        Navigation.navbar();
    }

    private static void waitForUserInput() {
        try {
            System.in.read();
        } catch (IOException e) {
            System.out.println("Error while waiting for user input: " + e.getMessage());
        }
    }

    private static String getPath() {
        try {
            return new File(".").getCanonicalPath();
        } catch (IOException e) {
            System.out.println("Error: while getting the path of the program.");
            return "";
        }
    }

    private static void displayGraph(ServerStats[] servers) {
        System.out.println("Server Statistics Bar Graph:\n");

        // Find the maximum value for scaling
        int maxErrorCount = getMaxValue(servers, ServerStats::getErrorCount);
        int maxQueriesPerMonth = getMaxValue(servers, ServerStats::getQueriesPerMonth);

        // Display the headers with proper formatting
        System.out.printf("%-15s%-15s%-15s%-15s\n", "ServerName", "ErrorCount", "QueriesPerMonth", "Graph");

        // Display the data with proper formatting
        for (ServerStats server : servers) {
            // Calculate the length of the graph bars based on the scaling
            int errorCountLength = scaleValue(server.getErrorCount(), maxErrorCount, 15);
            int queriesPerMonthLength = scaleValue(server.getQueriesPerMonth(), maxQueriesPerMonth, 15);

            // Display the data along with the graph bars
            System.out.printf("%-15s%-15s%-15s%-15s\n",
                    server.getServerName(), server.getErrorCount(), server.getQueriesPerMonth(),
                    getGraphBar(errorCountLength) + " " + getGraphBar(queriesPerMonthLength));
        }
    }

    private static int getMaxValue(ServerStats[] servers, ServerStatsValueExtractor extractor) {
        return Arrays.stream(servers)
                .mapToInt(extractor::extract)
                .max()
                .orElse(0);
    }

    private static int scaleValue(int value, int maxValue, int maxLength) {
        return (int) ((double) value / maxValue * maxLength);
    }

    //gets asterisks according to data:
    private static String getGraphBar(int length) {
        return "*".repeat(Math.max(0, length));
    }

    //used an interface to get stats:
    interface ServerStatsValueExtractor {
        int extract(ServerStats serverStats);
    }
}